Anatomy Atlases: Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

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Atlas of Human Anatomy in Cross Section: Section 4. Upper Limb

Plate 4.30

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Jean J. Jew, M.D., and Paul C. Reimann, B.S.
Peer Review Status: Externally Peer Reviewed

Upper Left Quadrant	Lower Left Quadrant	Lower Right Quadrant	Upper Right Quadrant
1. Tendon m. palmaris longus, palmar aponeurosis 2. Flexor pollicis m. 3. Abductor pollicis brevis m. 4. Tendon m. flexor pollicis longus 5. Adductor pollicis m. 6. Opponens pollicis m.	7. Tendon m. extensor pollicis brevis 8. First metacarpal 9. Tendon m. extensor pollicis longus 10. Dorsal interosseous m. 11. Adductor pollicis m. 12. Second metacarpal 13. Palmar metacarpal ligament 14. Dorsal interosseous m.	15. Third metacarpal 16. Dorsal metacarpal ligament 17. Fourth metacarpal 18. Dorsal v. of hand 19. Radial a., deep palmar arch 20. Dorsal v. of hand 21. Dorsal interosseous m. 22. Fifth metacarpal 23. Interosseous m., palmar (volar)	24. Abductor digiti minimi m. and tendons m. flexor digitorum profundus 25. Opponens digiti minimi m. 26. Tendons m. flexor digitorum superficialis 27. Flexor digiti minimi brevis m. 28. Palmaris brevis m. 29. Ulnar a. and nerve 30. Median nerve

This section is distal to the carpal canal. The thenar (2, 5, 6) and hypothenar (24, 25, 27) muscles dominate the medial and lateral palmer surface of the hand. Palmaris longus tendon (1) has begun to expand to form the palmer aponeurosis. The distal edge of palmaris brevis (28) is seen for the last time.

The bases of the metacarpal bones can be seen. Note that the fifth (22), fourth (17), third (15), and second (12) metacarpal bones articulate with each other at their bases and that the first (8) articulates only with the trapezium. The dorsal (16) and palmer (13) metacarpal ligaments are seen.

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